Reaction model of dense Sm0.5Sr0.5CoO3 as SOFC cathode

被引：186
|
作者：
Fukunaga, H
Koyama, M
Takahashi, N
Wen, C
Yamada, K
机构：
[1] Shinshu Univ, Dept Fine Mat Engn, Ueda, Nagano 3868567, Japan
[2] Univ Tokyo, Dept Chem Syst Engn, Bunkyo Ku, Tokyo 1138656, Japan
来源：
SOLID STATE IONICS | 2000年 / 132卷 / 3-4期
关键词：
solid oxide fuel cell; SmSrCoO3; dense electrode; cathodic reaction model; adsorption; desorption; rate constant; interfacial conductivity;
D O I：
10.1016/S0167-2738(00)00642-1
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Overpotential and AC impedance spectra were measured to study the reaction model of dense Sm0.5Sr0.5CoO3 (SSC) as SOFC cathode. From the P-O2 dependence of interfacial conductivity, the rate determining step of dense SSC electrode was adsorption and desorption processes at the surface of the electrode. Rate constants of adsorption and desorption were calculated from the interfacial conductivity of the dense electrode to be 3 x 10(-5) mol cm(-2) s(-1) atm(-1) and 2 x 10(-8) mol cm(-2) s(-1), respectively. These were approximately one order of magnitude larger than the corresponding values calculated for La0.6Sr0.4CaO3. These rate constants can elucidate the overpotentials of porous electrodes. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：279 / 285
页数：7
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